To move or adjust the front surface or panel of an object or component so that it is nearer, sealed, or less open; a term used in mechanical or engineering contexts.
2.
British EnglishUS Englishinformal
To adopt a closed, unfriendly, or expressionless facial appearance; to stop showing one’s usual expression or openness.
3.
Historic/Globalarchaicliterary
To conceal or bring to an end the outward appearance of something; used in older or literary language to mean to shut off or hide a view or aspect.