der Handschlag
handshake
The mutual clasping of hands as a greeting, farewell, or to seal an agreement.
Zur Begrüßung gab der Chef jedem Mitarbeiter einen festen Handschlag.
As a greeting, the boss gave each employee a firm handshake.

handshake
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handshake
The mutual clasping of hands as a greeting, farewell, or to seal an agreement.
Zur Begrüßung gab der Chef jedem Mitarbeiter einen festen Handschlag.
As a greeting, the boss gave each employee a firm handshake.

The word consists of 'Hand' (hand) and 'Schlag' (blow/strike). Although 'Schlag' often means 'Stoß' (push/thrust) or 'Hieb' (blow), here it describes the brief, firm contact of the hands when shaking hands.
Ein Handschlag ist eine Geste, bei der sich Hände kurz berühren.
A handshake is a gesture in which hands briefly touch.
You 'gibt' (give) someone a 'Handschlag' (handshake). The handshake is often described more precisely with an adjective, for example 'ein fester Handschlag' (a firm handshake) or 'ein kurzer Handschlag' (a brief handshake).
Der Manager gab jedem Bewerber zur Begrüßung einen festen Handschlag.
The manager gave each applicant a firm handshake as a greeting.
The expression 'per Handschlag' (by handshake) is a fixed unit and means that an agreement is sealed orally and by shaking hands. It is often used with verbs such as 'besiegeln' (to seal), 'vereinbaren' (to agree), or 'beschließen' (to decide/conclude).
Die beiden Geschäftspartner besiegelten den Deal per Handschlag.
The two business partners sealed the deal by handshake.
agreement
'die Vereinbarung' and 'der Handschlag' can both have to do with an agreement. A 'Vereinbarung' is the agreement itself: you establish what is supposed to apply. It can be oral or written. A 'Handschlag' is actually a gesture with the hands. But it can show that you are confirming an agreement. Learners may confuse the words because people say that something was agreed 'per Handschlag' (by handshake). In that case, the handshake is the way the agreement is sealed, not the content of the agreement.

Nach dem Gespräch besiegelten sie den Verkauf per Handschlag.
After the conversation, they sealed the sale with a handshake.
Die Vereinbarung mit dem Vermieter gilt ab nächstem Monat.
The agreement with the landlord applies starting next month.