with an underhand movement / in a sly, sneaky or secret manner

To toss or lob with an underhand movement. / To trick, deceive or gull. / (mining) To excavate downward in successive steps or horizontal slices while positioned above on unbroken ore.

(textiles) The lower of two hands, the hand under the work.

(transitive, obsolete) To go or move under or beneath. / (transitive) To experience; to pass through a phase. / (transitive) To suffer or endure; bear with.

(transitive) To perceive (someone or something) as having a lower value, quantity, worth, etc., than what he/she/it actually has.

An estimate that is too low.

In secrecy or in hiding. / (horse-racing) Of a horse: restrained from performing at its best in a race, so as to mislead others regarding its potential.

(horse racing) Across the finish line. / (idiomatic) At the last minute; before the deadline; barely on time; nearly late.

(idiomatic) Without attracting notice; in an undetected or secretive manner.

(UK, rail transport) The London Underground.