Tumbling upside down; somersaulting. / At top speed; frantically. / (usually with in love) Hopelessly, madly, to distraction, deeply, utterly.

Hopelessly smitten, madly in love.

(idiomatic) More complex or confusing than one can understand; beyond one’s comprehension. / (idiomatic) More than one can handle; too much (especially in over one's head).

Used other than figuratively or idiomatically: see bend over, backwards. / (idiomatic, informal) To make a great effort; to take extraordinary care; to go to great lengths.

(idiomatic) Such that the substance of the contest is complete, leaving only the cheering.

(Australia, New Zealand, Britain, idiomatic, vulgar) Tumbling; falling; upside-down, unstable or unbalanced.

(idiomatic) In multiple directions or locations, often haphazardly; everywhere. / (idiomatic) Inconsistent; lacking a clear pattern; with a large amount of variation.

(idiomatic) Quickly or in great quantity, especially in reference to earning money.

(idiomatic) Widely scattered or distributed; numerous and differing greatly. / (idiomatic) In widely scattered directions; in a widely varying manner.

(transitive, idiomatic) To treat (someone) roughly or without care, control, moderation, or respect; to act in a bullying manner toward (someone); to damage (someone or something).