Meanings

heavy and hard (of a wood)

duality

double-slit experiment

holder of multiple (e.g. dual) citizenships

material fact

double-booking

impost

short weight

to put (one's) weight on (e.g. one leg)

double disaster

unimportant things

high alert

double factorial

double glazing

load-bearing capacity

two prices (for the same product)

body weight training

spending heavily on virtual goods or premium features (in a video game, on a social networking service, etc.)

attaching paramount weight (to)

to paint over