intensify
v.to become stronger or more serious, or to make something do so. You use this when a feeling, a sound, or a situation gets much more powerful.
v.to increase in degree, strength, or magnitude; to make something more intense. Functions as both a transitive and intransitive verb.
“The rain began to intensify as the sun went down.”
“The police decided to intensify their search for the missing hiker after finding a backpack near the river.”
“Diplomatic efforts to resolve the border dispute are expected to intensify over the coming weeks as both nations face mounting pressure from the international community.”
Can be used intransitively (the storm intensified) or transitively (they intensified their efforts).
Learners often use the passive voice for natural processes that are better described using the intransitive active form.
Usage intensifying campaign · intensified since
“The 2026 K League season started on February 28 and is due to finish on December 6, but in the current climate, calls to move the traditional schedule have intensified.”
“Her daughter’s seizures have intensified since the move, she sleeps on the floor and Huda is painfully blunt: “My daughter is dying slowly.” Antiracist protesters outside the Bell in July 2025.”
Common in science writing
From intense + -ify. Compare French intensifier.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.