
einstecken
to put in
To put something into a pocket, bag, or another container.
Er hat sein Portemonnaie in die Jackentasche eingesteckt.
He put his wallet in his jacket pocket.
to put in / to take
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to put in
To put something into a pocket, bag, or another container.
Er hat sein Portemonnaie in die Jackentasche eingesteckt.
He put his wallet in his jacket pocket.

to take
To have to accept or endure something negative, such as criticism, a defeat, or a blow.
Im Boxkampf musste er einige harte Schläge einstecken.
In the boxing match, he had to take several hard blows.

to pocket
To keep something for oneself or take it, often in a dishonest or secretive way.
Der Kassierer hat am Ende des Tages etwas Geld eingesteckt.
At the end of the day, the cashier pocketed some money.
'Einstecken' (to put in / to take) is a separable verb. In a main clause, the prefix 'ein-' comes at the end of the sentence. In the infinitive with 'zu', 'zu' comes between the prefix and the verb.
Er steckt den Schlüssel in seine Hosentasche ein.
He puts the key in his trouser pocket.
The verb consists of 'ein-' (in/into) and 'stecken' (to put/stick). The literal meaning 'to put something into something' is the basis for the figurative meanings.
Steck den Stecker in die Steckdose ein.
Plug the plug into the socket.
You can recognize the literal meaning from the fact that it involves a concrete object (e.g., phone, money) and a concrete place (e.g., pocket, backpack).
Sie hat den Brief schnell in ihre Handtasche eingesteckt.
She quickly put the letter in her handbag.
In the figurative meaning 'to endure,' 'einstecken' is often combined with negative, abstract things. Typical phrases are: 'Kritik einstecken' (to take criticism), 'eine Niederlage einstecken' (to suffer a defeat), or 'einen Verlust einstecken' (to take a loss).
Die Mannschaft musste eine schwere Niederlage einstecken.
The team had to suffer a heavy defeat.
The meaning 'to secretly keep something for oneself' is colloquial and has a negative connotation. It implies that the action is dishonest.
Hat er das Wechselgeld einfach eingesteckt?
Did he simply pocket the change?
to accept / assume
When talking about criticism, both „annehmen“ and „einstecken“ can fit. „Annehmen“ emphasizes accepting or taking the criticism on board, while „einstecken“ highlights having to endure something negative. Choose „annehmen“ when the focus is on a possible reaction and „einstecken“ when the focus is on the burden caused by the criticism.

Der Redakteur musste die Kritik einstecken, obwohl er anderer Meinung war.
The editor had to take the criticism, even though he disagreed.
Die Redakteurin nahm die Kritik an und überarbeitete den Artikel.
The editor accepted the criticism and revised the article.