step in

listen to the pronunciation of step in
English - English
To act as a replacement or substitute
To get involved; to act
If you step in, you get involved in a difficult situation because you think you can or should help with it. There are circumstances in which the State must step in to protect children. = intervene
act as a substitute; "She stood in for the soprano who suffered from a cold"
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?"
intervene, interfere
An item of clothing which one steps into to put on; specifically, women's panties

Doc got that step-in in Memphis,’ the third said. ‘Off a damn whore.’.

step in
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