slip in

present singular third person slips in · participle present slipping in · participle past slipped in · past slipped in

1. transitiveTo include (e.g. a certain word or phrase) into a sentence discreetly.
2. transitiveTo enter discreetly.

   The visitors we do not encourage are the many small boys who slip in unobserved and are a danger to themselves and the staff.

   1960 April 28, A. W. Bennett, “A Locomotive Shedmaster's Day”, in Railway Magazine, page 273

3. transitiveball gamesTo play a subtle pass into someone in a goalscoring position.

   A minute into the second half, Hazard blasted the second goal right over Gordon's head and into his net. Soon after, Charlie Mulgrew's aimless ball out of defence fell to Dembele, who gave it to Hazard. The attacker slipped in Batshuayi in for the third.

   2018 September 7, Tom English, “Scotland 0-4 Belgium”, in BBC Sport