Sustain
Definition 1 of 4
Pro Tip 1/2
Physical support
Use 'sustain' when you talk about something providing physical support over time. The beams sustain the entire weight of the building.
Pro Tip 2/2
Long-term aspect
Emphasize the duration with 'sustain'; it's not just supporting, but doing so for a long period. Only a few athletes can sustain peak performance for many years.