harness

1 harness /ˈhɑɚnəs/ noun
plural harnesses
1 harness
/ˈhɑɚnəs/
noun
plural harnesses
Britannica Dictionary definition of HARNESS
[count]
1 
: a set of straps that are placed on an animal (such as a horse) so that it can pull something heavy
2 
: a set of straps that are used to connect a person to something (such as a parachute or a seat)

in harness

British
: working at a job : on duty
2 harness /ˈhɑɚnəs/ verb
harnesses; harnessed; harnessing
2 harness
/ˈhɑɚnəs/
verb
harnesses; harnessed; harnessing
Britannica Dictionary definition of HARNESS
[+ object]
1 
a  : to put a harness on (an animal)
b  : to attach (an animal) to something with a harness
2 
: to use (something) for a particular purpose
3 
: to connect or join (things) together