lask UK /lɑːsk/US /læsk/adjective 1noun 1verb 1forms 5 adjective1 •(no longer used) Lax, weak; specifically of the bowels: affected by diarrhoea; loose. noun1 •Originally of both persons and animals, now only of animals: looseness of the bowels; diarrhoea; (countable) a bout of this ailment.Pannick stoppeth the laske as Millet doth, being boiled (as Plinie reporteth) in Goates milk and drunke twise in a day. — 1597 verb1 •(no longer used) To have loose bowels; to suffer from diarrhoea. formslasked · lasking · lasks · more lask · most lask