Noun step in has 1 sense
- pantie, panty, scanty, step-in - short underpants for women or children (usually used in the plural)
--1 is a kind of underpants
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Verb step in has 2 senses
- intervene, step in, interfere, interpose - get involved, so as to alter or hinder an action, or through force or threat of force; "Why did the U.S. not intervene earlier in WW II?"
--1 is one way to interact
Sample sentences:
Somebody ----s
Somebody ----s PP
- substitute, deputize, deputise, step in - act as a substitute; "She stood in for the soprano who suffered from a cold"
--2 is one way to supplant, replace, supersede, supervene upon
Sample sentence:
Somebody ----s somebody
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