the mind > language > speech > agreement > make an agreement [verb (intransitive)] > in a specific way (3)
absol. or intransitive apparently To ‘strike hands’ in token of an agreement or bargain. Obsolete. rare.
to strike hands (said of two parties to a bargain): To take one another by the hand in confirmation of a bargain; hence, to ratify a bargain with…
To strike (hands) reciprocally, in token of a bargain. Obsolete.