run around

verb

1. (often foll by with) to associate habitually (with)

2. to behave in a fickle or promiscuous manner

noun

1. informal,  deceitful or evasive treatment of a person (esp in the phrase give or get the run-around )

2. printing an arrangement of printed matter in which the column width is narrowed to accommodate an illustration

Idioms and Phrases

Go about hurriedly here and there, as in I have been running around all day so I want to stay home tonight and relax . [Early 1900s]

Also, run around with . Associate or consort with socially, as in At college she began to run around with a very liberal group . [Late 1800s]

Be sexually unfaithful, as in She caught him running around just once too often and finally sued for divorce . [Early 1900s]