After delivering its message, some of the neurotransmitter is used up in the production of energy, and some of it is reabsorbed by the axon that released it to await the next neural impulse. in the context of synaptic transmission, this reabsorption is called reuptake revision inhibition depolarization

The answer is reuptake. 

Reuptake is a term used when a neurotransmitter is taken back by the axon after being used. By doing reuptake, the synapse will be cleaned out of the neurotransmitter, making it stop giving the signal.
Some drug target reuptake mechanism like serotonin reuptake inhibitor that used for depression. This drug can increase serotonin by inhibiting the reuptake mechanism.