tightly

In other words, they take a whole bunch of bouncing-around molecules and bond them together tightly to store chemical energy in sugars like glucose.

As dark energy pushes the rest of the universe away from us the Local Group will become more tightly bound.

We are in part also the trees, the houses, the clouds overhead, the pigeon who has come to peck at a leftover sandwich and the young boy now being hugged tightly by his dad.