fälla upp

Verb

 * 1) to unfold (something more or less rigid, so as to bring it into a less compact (and often "activated") state)
 * 2) to open, to put up, to flip up, etc. (when more idiomatic)
 * 1) to open, to put up, to flip up, etc. (when more idiomatic)
 * 1) to open, to put up, to flip up, etc. (when more idiomatic)

Usage notes
Might rarely instead mean the opposite, if the "closed/deactivated" position of something is up.