anheuern
to hire on
To hire or engage someone to work on a ship.
Der Kapitän heuerte in Hamburg neue Matrosen für die Überfahrt an.
The captain hired on new sailors in Hamburg for the crossing.

to hire
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to hire on
To hire or engage someone to work on a ship.
Der Kapitän heuerte in Hamburg neue Matrosen für die Überfahrt an.
The captain hired on new sailors in Hamburg for the crossing.

'Anheuern' (to hire) is a separable verb. In a main clause, the prefix 'an-' stands at the end; in a subordinate clause, it remains attached to the verb.
Das Filmstudio heuerte einen berühmten Regisseur für das Projekt an.
The film studio hired a famous director for the project.
The meaning depends heavily on the context. In connection with ships, seafaring, and sailors, the original, literal meaning is intended. In all other contexts, it is used informally for 'einstellen' (to hire) or 'beauftragen' (to commission).
Für die lange Seereise musste eine komplett neue Mannschaft angeheuert werden.
A completely new crew had to be hired on for the long sea voyage.
In the original seafaring meaning, 'anheuern' (to hire on) is typically used with people or groups who work on a ship: 'Matrosen anheuern' (to hire on sailors), 'eine Mannschaft anheuern' (to hire on a crew), 'Personal anheuern' (to hire on staff).
Der Kapitän konnte im Hafen schnell zwei neue Seeleute anheuern.
The captain was able to quickly hire on two new sailors in the harbor.
The general meaning 'jemanden einstellen' (to hire someone) is informal. In formal or business texts, you would more likely find words such as 'einstellen' (to hire), 'beauftragen' (to commission), or 'engagieren' (to engage/hire).
Für den Umzug haben wir ein paar starke Helfer angeheuert.
We hired a few strong helpers for the move.
to occupy / employ
'beschäftigen' and 'anheuern' can both mean that someone is taken on for work. 'beschäftigen' is the neutral word for an employment relationship in companies, clubs, or other organizations. 'anheuern' originally comes from work on a ship and fits especially well there. Informally, it can also mean bringing someone in for a specific task or job. 'anheuern' often sounds less official than 'beschäftigen' and emphasizes more the idea of recruiting someone for a task.

Für die lange Fahrt heuert der Kapitän zwei neue Matrosen an.
For the long voyage, the captain hires on two new sailors.
Die Reederei beschäftigt viele erfahrene Techniker.
The shipping company employs many experienced technicians.