plough

• (british) big dipper, type of constellation (astronomy)
(british spelling for plow) farming tool used for cutting into the ground
(british spelling for plow) cut into the soil with a plough; advance through great effort; pave the way; fail, not succeed
a plough is a large farming tool with sharp blades that is pulled across the soil to turn it over, usually before seeds are planted.
when someone ploughs an area of land, they turn over the soil using a plough.
if you plough profits back into a business, you spend the profits on things that will improve the business so that you can make more money in the long term.
if one thing ploughs into another, it crashes into it.
if someone ploughs money into a business or organization, they invest large sums of money in it.
if you plough on, you continue with a task even though it is difficult or unpleasant.
if you plough through a meal or a piece of work, you eat it all or do it all, although it is difficult because there is a lot of it.
to plough through something means to move through it with a great deal of force.
if an area of grassland is ploughed up, the soil is turned over using a plough, so that crops can be grown there.