in·ter·act 
(ĭn′tər-ăkt)
(ĭn′tər-ăkt)intr.v. in·ter·act·ed, in·ter·act·ing, in·ter·acts
To act on each other: "More than a dozen variable factors could interact, with their permutations running into the thousands" (Tom Clancy).
- get even with
- get feet wet
- get-go
- get goat
- get going
- get hackles up
- get hands on
- get/have (someone's) number
- get/have the best of
- get/have the drop on
- get/have the worst of it
- get hold of
- get hold of
- get hold (or ahold)of
- get hold (or ahold) of
- gethsemane
- Gethsemane
- get in
- get into
- get into bed with
- get into the act
- get it
- get it all together
- get it on
- get it up