USUKinternationalneutralinformal
- To bend forward abruptly, typically because of severe pain, cramping, or sudden laughter.
- To clutch or fold the torso forward as a reflexive reaction to discomfort or amusement.
USUKinternationalneutraltechnical
- To fold something back upon itself so that one part lies on or against another part; to fold in two (transitive).
USUKinternationalneutralformal
- To increase to twice a previous amount within a given period (intransitive), as in projections or estimates where a quantity is expected to double over a specified timespan.