Visit informally (4,2)

I believe the answer is:

drop in

'visit informally' is the definition.
(synonyms)

This is all the clue.

(Other definitions for drop in that I've seen before include "Pay a casual visit - by parachute" , "Briefly visit" , "Visit informally" , "home visit" , "Pay a casual visit unannounced" .)

I've seen this clue in The Guardian and The Times.

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