sich umsehen
to look around
To turn one's head or body in order to look at the surroundings or at something behind one.
Er hörte ein Geräusch und sah sich erschrocken um.
He heard a noise and looked around in alarm.

to look around
Loading your saved state.
to look around
To turn one's head or body in order to look at the surroundings or at something behind one.
Er hörte ein Geräusch und sah sich erschrocken um.
He heard a noise and looked around in alarm.

'Umsehen' (to look around) is a separable verb. In a main clause, the prefix 'um' goes at the end. In a subordinate clause or in the infinitive with 'zu', the verb stays together.
Sie sieht sich in der neuen Stadt um.
She looks around in the new city.
The verb 'umsehen' (to look around) is always used reflexively, meaning with a reflexive pronoun (mich, dich, sich, uns, euch, sich). The pronoun agrees with the subject of the sentence.
Ich sehe mich nach einem neuen Job um.
I'm looking around for a new job.
The sentence 'Ich sehe mich nur um' (I'm just looking around) is a very common and polite answer to sales staff in a shop when you only want to look and do not want to buy anything specific.
Verkäufer: Kann ich Ihnen helfen? Kunde: Nein danke, ich sehe mich nur um.
Salesperson: Can I help you? Customer: No thanks, I'm just looking around.
When 'sich umsehen' (to look around for) has the meaning of 'to actively search,' it is always used with the preposition 'nach' and the dative. The structure is: sich nach etwas (dative) umsehen.
Er sieht sich nach einer günstigeren Versicherung um.
He's looking around for cheaper insurance.
to search / look for
'suchen' and 'sich umsehen' can both mean that you want to find something. 'suchen' sounds more direct and goal-oriented: you need something specific and are trying to find it. 'sich umsehen' is often more relaxed. You look around in a place or check out possibilities without having to decide right away. With 'sich nach etwas umsehen', however, it can also become active, for example when looking for an apartment or a new job. The words can be confused because both fit when talking about apartments, work, or shopping. 'suchen' is more precise when the goal is fixed; 'sich umsehen' fits when you first want to get an overview.

Im Möbelhaus sehen wir uns erst einmal um, bevor wir etwas kaufen.
At the furniture store, we look around first before buying anything.
Wir suchen eine größere Wohnung, weil das Baby bald kommt.
We are looking for a bigger apartment because the baby is coming soon.