play, amuse oneself, enjoy oneself / spend one's time idle, do nothing / for an item not to be in use, be spare or idle

to be slippery, to be slimy / (only ぬめる) to exude charm; to walk jollily

glide, slide / slip, skid / fail an exam / for words to slip out, commit a faux pas / (of a joke) to bomb

child

a slide, a slip / a change in value / slide for a microscope

slide, slip / change in value

park

a glass slide, a microscope slide

plural of 子供: children

child's naive mind, child's juvenile mind