act up

Fetched 2026-10-26 (cache).

Synonyms: acts up, act-up

Antonyms: acts up, act-up

Related words from Datamuse; suggestions, not definitions.

Verb

1. {{lb|en|intransitive|idiomatic}} To [[misbehave]]; to cause [[trouble]].
2. {{lb|en|intransitive|idiomatic}} To [[perform]] the [[duty|duties]] of an [[appointment]] [[senior]] to that actually held; to [[deputise]] for a [[superior]].

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.