To send (soldiers, spies, etc.) through gaps in the enemy line.
To cause to penetrate in this way.
To invade or penetrate a tissue or organ.
To surreptitiously penetrate, enter or gain access to.
To pass through something by filtration.
To move from a vein, remaining in the body.
To cause (a liquid) to pass through something by filtration.
Any undesirable substance or group of cells that has made its way into part of the body.
To give place or step aside.
To make progress.
To progress through the water.
an instruction to get out of the way of someone else, usually because they are carrying something and need a clear pathway. Compare with gangway.