(grammar, also attributively) In Latin and other languages: a type of verbal noun used in the ablative and accusative cases, which shares the same stem as the passive participle.

(grammar, also attributively) In Swedish, Faroese, Icelandic and Old Norse: a verb form that combines with an inflection of ha/hafa/hava to form the present perfect and pluperfect tenses.

(grammar, also attributively) (obsolete terminology) The 'to'-prefixed infinitive in English or other Germanic languages, so named because the infinitive was regarded as a verbal noun and the 'to'-prefixed form of it was seen as the dative form of the verbal noun; the full infinitive.

Lying on its back.

(of the hand, forearm or foot) turned facing toward the body; with the thumb outward or the big toe upward.

(figuratively) Reluctant to take action due to indifference or moral weakness; apathetic or passive towards something.

(rare, now poetic) Inclining or leaning backward; inclined, sloping.