1 verb of cause, basis TRANSITIVEbheith mar bhunús lethe principles that underlie the policyna prionsabail is bonn leis an bpolasaí, na prionsabail ar a bhfuil an polasaí bunaithe2 verb rock, soil etc TRANSITIVEthe rock underlying the roadan charraig atá faoi bhun an bhóthair, an charraig atá faoin mbóthar
