wapper
To exhaust; to tire out.
obsolete, transitive
this is it, That makes the wapper'd widow wed again;
To move weakly or tremulously; to flag.
intransitive
But still he stode, his face to set awrye, And wappering turnid vp his white of eye.
Where it comes from
Frequentative of wap; compare German dialect wappern, wippern (“to move up and down, to rock”).
Adapted from the Wiktionary entry wapper (CC BY-SA 4.0).