oar
keep both oars in the water maintain a calm equilibrium in your life and affairs.
rest on your oars
1 cease rowing by leaning on the handles of your oars, thereby lifting them horizontally out of the water.
2 relax your efforts.
☞ A US variant of this phrase is lay on your oars.
stick (or poke or put or shove) your oar in give an opinion or advice without being asked. informal
2013JayneOur Great Southern Land Public servants in the Federal Govt couldn't help but stick their oar in and have their tuppence ha'penny worth of drivel by interfering in discussions between the Tasmanian Aboriginal Centre and museums in England regarding the repatriation of Aboriginal remains.