untack
Pull pins out
To untack is to remove tacks—small nails or pins—from something: She untacked the posters from the wall.
In equestrian contexts, untack means to remove a horse's tack (saddle, bridle, and other gear) after riding: I'll untack the horses while you grab the brushes.
detach
To separate from
loosen · disengage · separate · unbolt · uncouple · unlatch · unclip · unstick · unbuckle · unstrap
saddle
Mounted rider's seat
stirrups · martingale · halter · reins · breastplate · cinch · surcingle · unbridle · grooming · stabling
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