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slip-in
slip-in adj.
Brit. 
/ˈslɪpɪn/
, /ˈslɪpɪn/U.S. /ˈslɪpˌɪn/
admitting of a person or thing slipping in, or being slipped in, easily or readily./ˈslɪpˌɪn/ΘΠ
the world > movement > motion in a certain direction > going or coming in > [adjective] > admitting of being slipped into
slip-in1859
1859 G. A. Sala Gaslight & Daylight xxii. 252 He knows all the slip-in and slip-out public-houses in London.
1906 Westm. Gaz. 1 Dec. 18/2 Both slip-in and paste-on mounts, upon which the photographs can be mounted with the minimum of trouble.
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