yacer meaning in English

lay [laid, laying, lays]▼(to have sex with)
verb
[UK: leɪ] [US: ˈleɪ]An old man lay dead on the road. = Un anciano yacía muerto en el camino.

lie [lied, lying, lies]▼(be in horizontal position)
verb
[UK: laɪ] [US: ˈlaɪ]

lie down▼(assume a reclining position)
verb
[UK: laɪ daʊn] [US: ˈlaɪ ˈdaʊn]

underlie [underlay, underlain, underlying, underlies]▼(to serve as a basis of)
verb
[UK: ˌʌn.də.ˈlaɪ] [US: ˌʌn.dər.ˈlaɪ]The idea underlies his theory. = La idea subyace su teoría.