To fall behind relative to others. / To unwittingly hold up progress. / To deliberately hold up progress by acting slowly.

(chiefly US) To perform a mathematical calculation.

(simile) quickly, at a high speed. / (simile) changeably, freely and at liberty. / (simile) invisibly, mysteriously, unpredictably.

(idiomatic) obstructing, blocking, or hindering / (dated) Around; present; able to be found.

from then on; from that time on

(idiomatic) coming, approaching

Whilst travelling.

Alternative form of Pythagorean theorem

(idiomatic, euphemistic) To have anal sex; to insert one's penis (stem) into another's anus (rose).

(geometry) A mathematical theorem which states that the square of the length of the hypotenuse of a right triangle is equal to the sum of the squares of those of the two other sides.