1) Contract 2) Engage in a subcontract 3) Work under a subcontract 1) Farmout 
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where a large company, e.g. Nike, arranges for its goods to be produced by another company.
• (n.) A contract under, or subordinate to, a previous contract.
When a courier accepts a booking from a customer, they have a contract with the customer. If they farm the work out to you, that's a subcontract and you're a 'subbie'.
To hire someone to carry out some of the work that you have been contracted to do
Sub·con'tract noun A contract under, or subordinate to, a previous contract. 
[n] - a contract assigning to another party some obligations of a prior contract 2. [v] - let out under a subcontract 3. [v] - work under a subcontract
An agreement made with the contractor and subcontractor that outlines the specific work services for the project.
An agreement made between the main contractor and a subcontractor or trade contractor to perform a specified set of construction services. 
verb arranged for contracted work to be done by others noun a contract assigning to another party some obligations of a prior contract