(attributive) on call

Available to be summoned.

plural of calling

A telephone conversation; a phone call. / An instance of calling someone on the telephone. / A short visit, usually for social purposes. / (nautical) A visit by a ship or boat to a port.

(intransitive) To request, summon, or beckon. / (intransitive) To cry or shout. / (transitive) To utter in a loud or distinct voice. / (transitive, intransitive) To contact by telephone.

(of a TV or radio programme) In which members of the public telephone the studio and talk live to the presenter.

A TV or radio programme allowing members of the public to telephone the studio and talk live to the presenter. / A telephone call of this kind. / A caller who makes such a call.

Third-person singular simple present indicative form of call

plural of call

A strong urge to become religious. / A job or occupation.