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B1 · Intermediate Countable noun Sports

n. the act of hitting a ball with your head, usually in a game of football.

n. the action of striking a ball with the head to pass, clear, or score.

“He scored a fantastic goal with a powerful header in the last minute.”

“The defender's perfectly timed header cleared the ball from the penalty area, preventing a certain goal during the final minutes of the match.”

B2 · Upper Intermediate Countable noun Computing Technical

n. the first part of a computer file or message that explains what is inside.

n. the initial part of a data packet, file, or stream containing metadata, addresses, or descriptors.

Español:cabecera

“The email header contains information about the sender and the servers it passed through.”

“If the HTTP header is incorrectly configured, the browser may fail to render the content or might encounter security certificate errors.”

C1 · Advanced Countable noun Informal

n. a fall or dive where your head goes forward first.

n. a headlong fall, jump, or dive, often used in the phrase 'to take a header'.

“He tripped over the rug and took a header into the laundry basket.”

“The cyclist took a nasty header over the handlebars after hitting a deep pothole on the descent.”

C2 · Proficiency Countable noun Dialect · Informal

n. a person who acts in a crazy or unpredictable way.

n. a person perceived as mentally unbalanced, eccentric, or highly unpredictable.

“Don't mind him, he's a bit of a header when he's had a few drinks.”

“The locals warned us that the old man living on the hill was a total header who would shout at anyone passing his gate.”

B2 · Upper Intermediate Sports

v. to hit a ball with your head.

v. to strike a ball using the head, typically in a sporting context. Transitive use.

“The striker managed to header the ball into the corner of the net.”

“The coach spent the afternoon teaching the youth players how to safely header the ball without risking neck injury.”