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act out▼(to express one's feelings through disruptive actions)
verb
[UK: ækt ˈaʊt] [US: ˈækt ˈaʊt]

show off▼(to exhibit, to demonstrate something for the purpose of bragging)
verb
[UK: ʃəʊ ɒf] [US: ˈʃoʊ ˈɒf]

yuk it up▼(clown around)
verb