olemus
liikumisulatust piirav vahend, eeskätt mehaaniline

Wiktionary:
3. that which stops, impedes, or obstructs; an obstacle; an impediment
4. a device intended to block the path of a moving object
door stop
4.1. (engineering) a device, or piece, as a pin, block, pawl, etc., for arresting or limiting motion, or for determining the position to which another part shall be brought
4. 2. (architecture) a member, plain or moulded, formed of a separate piece and fixed to a jamb, against which a door or window shuts

backstop -- 1. tõkesti 2. väljakupiire
doorstop -- uksetõkis

vt ka
- tõkis (1)