What is thrust?

thrust
THrəst/
verb
1.
push (something or someone) suddenly or violently in the specified direction.
"she thrust her hands into her pockets"
synonyms: shove, push, force, plunge, stick, drive, propel, ram, poke, jam More
(of a person) move or advance forcibly.
"she thrust through the bramble canes"
synonyms: push, shove, force, elbow, shoulder, barge, bulldoze
"he thrust his way past her"
(of a thing) extend so as to project conspicuously.
"beside the boathouse a jetty thrust out into the water"
force (someone) to accept or deal with something.
"he felt that fame had been thrust upon him"
noun
noun: thrust; plural noun: thrusts; noun: thrust fault; plural noun: thrust faults
1.
a sudden or violent lunge with a pointed weapon or a bodily part.
"he drove the blade upward with one powerful thrust"
synonyms: shove, push, lunge, poke
"a hard thrust"
a forceful attack or effort.
"executives led a new thrust in business development"
synonyms: advance, push, drive, attack, assault, onslaught, offensive, charge, sortie, foray, raid, sally, invasion, incursion
"a thrust led by Canadian forces"
the principal purpose or theme of a course of action or line of reasoning.
"anti-Americanism became the main thrust of their policy"
synonyms: gist, substance, drift, burden, meaning, sense, theme, message, import, tenor
"the thrust of the speech"
2.
the propulsive force of a jet or rocket engine.
synonyms: force, propulsive force, propulsion, power, impetus, momentum
"only one engine is producing thrust"
the lateral pressure exerted by an arch or other support in a building.