sil up v.
(UK Und.) to behave foolishly.
![[US]](/static/img/flags/us.png "United States") | Prison Community (1940) 335/2: sil up, vph. To affect a silly or foolish attitude; used to attract attention in begging, or to disarm a policeman after an arrest. |
(UK Und.) to behave foolishly.
| Prison Community (1940) 335/2: sil up, vph. To affect a silly or foolish attitude; used to attract attention in begging, or to disarm a policeman after an arrest. |