geschlagen
beaten
Having been defeated in a fight, competition, or dispute.
Nach einem langen Finale musste sich die Mannschaft knapp geschlagen geben.
After a long final, the team had to admit they were narrowly beaten.

beaten / whipped
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beaten
Having been defeated in a fight, competition, or dispute.
Nach einem langen Finale musste sich die Mannschaft knapp geschlagen geben.
After a long final, the team had to admit they were narrowly beaten.

'Geschlagen' is the past participle of the verb 'schlagen' (to hit/beat). Almost all meanings derive from the basic idea of hitting or defeating: you can be beaten in sports, cream is whipped, or you can be struck by fate.
Die geschlagene Mannschaft verließ enttäuscht das Spielfeld.
The beaten team left the playing field disappointed.
In the meaning 'besiegt' (defeated), the reflexive expression 'sich geschlagen geben' is often used. It means that you accept your defeat or give up.
Nach stundenlanger Diskussion gab er sich endlich geschlagen.
After hours of discussion, he finally admitted defeat.
When 'geschlagen' emphasizes an expression of time or quantity, it stands unchanged directly before the number. It stresses how long something is or how large the amount is, often with a feeling of surprise or annoyance.
Ich habe geschlagene drei Stunden auf diesen Anruf gewartet.
I waited a full three hours for this call.
You can always recognize this meaning from the context of cooking or baking. Typical combinations are 'geschlagene Sahne' (whipped cream) or 'steif geschlagenes Eiweiß' (egg whites beaten until stiff).
Der Kuchen wird mit geschlagener Sahne serviert.
The cake is served with whipped cream.
The expression 'mit etwas geschlagen sein' (to be afflicted with something) is fixed and always uses the preposition 'mit' followed by the dative. It describes that someone suffers from a negative trait or an unfortunate circumstance.
Er ist mit einer schrecklichen Singstimme geschlagen.
He is afflicted with a terrible singing voice.
whole / quite
'ganz' and 'geschlagen' can seem similar with expressions of time or quantity. 'ganz' then means 'full' or 'complete', for example 'eine ganze Stunde' (a whole hour). 'geschlagen' also comes before such expressions, but emphasizes them more strongly and often sounds a bit surprised or annoyed: 'geschlagene zwei Stunden' (a full two hours). Learners may confuse the words because both express a full duration or quantity. In neutral everyday language, 'ganz' is more often suitable. You use 'geschlagen' when you want to especially emphasize the length or size.

Nach dem Unterricht saß Mehmet geschlagene drei Stunden an den Hausaufgaben.
After class, Mehmet spent a full three hours on his homework.
Sie wartet eine ganze Stunde auf den Bus.
She waits a whole hour for the bus.