For someone (actor; s actor maN-) to firm the body (patient -on) in preparation for doing something; i.e., to make the body rigid by flexing the muscles.
Odholon: focus, usually unexpressed, is on the body.
Odholom an bumad'ang hinan datong ta adī'a ma'ānud.
Firm (your body) in crossing the flood so that you won't drown.