English Reference

Word

flank

US/ˈfɫæŋk/

UK/flˈæŋk/

Definitions

01side of the body

B2 · Upper Intermediate Countable noun Medicine

n. the side of a person's or animal's body between the ribs and the hip.

n. the lateral part of the body between the last rib and the hip.

“The horse had a small white patch on its left flank.”

“The patient complained of a sharp, localized pain in her right flank, suggesting a potential issue with the kidney.”

Synonyms

sidehaunch

02military side

C1 · Advanced Countable noun Sports Formal

n. the right or left side of a group of soldiers or a sports team.

n. the extreme left or right edge of a military formation, army, or sports field.

“The fast runner moved down the left flank to cross the ball into the box.”

“The general ordered a surprise attack on the enemy's weakened eastern flank to break their defensive line.”

Synonyms

Antonyms

03cut of meat

B2 · Upper Intermediate Uncountable noun Cooking

n. a cut of beef from the side of the cow, often used for grilling.

n. a specific cut of meat from the abdominal muscles of an animal, typically lean and fibrous.

“We marinated the flank steak for three hours before putting it on the grill.”

“Because flank is a relatively tough cut of meat, it should be sliced thinly against the grain to ensure tenderness.”

Synonyms

flank steak

04to be on the sides of

B2 · Upper Intermediate

v. to be positioned on one or both sides of something or someone.

v. to be situated at the side of; in the passive, to be bordered on either side.

“Two tall stone towers flank the entrance to the castle.”

“The president walked toward the podium, flanked by security guards and senior advisors.”

Synonyms

05to move around the side

C1 · Advanced Law Formal

v. to move around the side of an enemy to attack them from a weaker spot.

v. to maneuver around the side of an opposing force so as to outflank or bypass their frontal defenses.

“The soldiers tried to flank the enemy instead of attacking from the front.”

“By successfully flanking the opposing battalion, the troops were able to seize the hilltop without a direct confrontation.”

Synonyms

outmaneuverbypass

06maximum speed

C2 · Proficiency American English · Technical

adj. the fastest speed a ship can go, usually used in an emergency.

adj. referring to the maximum possible speed of a vessel, exceeding 'full speed'.

“The captain ordered flank speed to reach the sinking boat as fast as possible.”

“The destroyer maintained flank speed for several hours during the pursuit, testing the limits of its propulsion system endurance.”

Usage

Usually used in the phrase 'flank speed'.

Synonyms

Real-World Examples

“He led with a photo of him and his kids – sons Xavier, 18, and Hadien, 12, and 17-year-old daughter Ella Grace – flanking his mother Margaret.”
Toronto Sun 14 Aug 2026
“Nuno Mendes galloped on to Kvaratskhelia’s flipped pass but the full-back’s cutback from the left flank evaded the £43m summer buy Maghnes Akliouche and three other blue and red shirts.”
The Guardian 12 Aug 2026
“Lake Chala is a small, steep-walled crater lake on the flank of Mount Kilimanjaro, fed by groundwater from the mountain’s forested slopes.”
Ars Technica 9 Aug 2026
“As they often did, her two eldest daughters flank her protectively.”
Smithsonian Magazine 16 Jul 2026

Etymology

From Late Middle English flanc, from Late Old English flanc (“flank”), from Old French flanc, of Germanic origin, probably Frankish hlanca, from Proto-Germanic hlankō (“bend, curve, hip, flank”), from Proto-Germanic hlankaz (“flexible, sleek, bendsome”), from Proto-Indo-European kleng- (“to bend”). Akin to Old High German hlanca (“loin”), Middle Low German lanke (“hip joint”) (German lenken (“to bend, turn, lead”)), Old English hlanc (“loose, slender, flaccid, lank”). More at lank.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

Word family

NOUN

flank(C1)

Domains

AnatomyCookingMilitaryNauticalPolitics

This entry

Exam level
CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.C1 AdvancedIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.7.0–8.0TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 5.0–5.595–113TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.945–990
Frequency
Frequent
Level
C1 · Advanced
Updated

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