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act (n)
act (v)
act as a go-between (v)
act for (v)
act honestly (v)
act of violence (n)
act on (v)
act out (v)
act up (v)
acting (adj)
acting (n)
action (n)
action-packed (adj)
actionable (adj)
actions (n)
activate (v)
activation (n)
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Dictionnaire Français

act up (v)
Synonyms: cause trouble, be difficult, misbehave, malfunction, go wrong, be on the blink, play up

Antonym: behave
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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