Maintain:
1 : to keep in an existing state (as of repair, efficiency, or validity) : preserve from failure or decline <maintain machinery>
2 : to sustain against opposition or danger : uphold and defend <maintain a position>
3 : to continue or persevere in : carry on, keep up <couldn't maintain his composure>
4 a : to support or provide for <has a family to maintain> b : sustain <enough
Pretty obvious.
1 : to keep in an existing state (as of repair, efficiency, or validity) : preserve from failure or decline <maintain machinery>
2 : to sustain against opposition or danger : uphold and defend <maintain a position>
3 : to continue or persevere in : carry on, keep up <couldn't maintain his composure>
4 a : to support or provide for <has a family to maintain> b : sustain <enough
Pretty obvious.