Three graves open with no tears
And in crouch three soldiers
Not in a row but paired and solo
Where they go, they go low
They brace, they flex
They do their duty and relax
Three graves open with no tears, And in crouch three soldiers
Are you bowling, the three soldiers being your two fingers and the thumb, fitting in the three holes.
Not in a row but paired and solo, Where they go, they go low
They brace, they flex, They do their duty and relax
They spin down the lane aiming to strike the pins before ending in the pit.
I think this is referring to
Three graves open with no tears
And in crouch three soldiers
The three graves here refer to the socket holes and the soldiers are the pins. The process of "opening" could be facilitated by the switch in the image above.
Not in a row but paired and solo
Two on the bottom, horizontal. One on the top, vertical.
Where they go, they go low
Usually plug sockets are positioned low on a wall (unless in a kitchen, for example).
They brace, they flex
Unsure about brace, but "flex" refers to the insulated cables within the plug.
They do their duty and relax
Facilitate the movement of electric current and stay still.