Exodus 27:20 NKJV
"And you shall command the children of Israel that they bring you pure oil of pressed olives for the light, to cause the lamp to burn continually.
It took effort to extract the oil. It involved pressing.
Spiritual parallel: Look at what the apostle Paul said.
Philippians 3:12-14 NKJV
Not that I have already attained, or am already perfected; but I press on, that I may lay hold of that for which Christ Jesus has also laid hold of me. Brethren, I do not count myself to have apprehended; but one thing I do, forgetting those things which are behind and reaching forward to those things which are ahead, I press toward the goal for the prize of the upward call of God in Christ Jesus.
If you were walking and suddenly decided it was more urgent than you previously thought to get where you were going, you would press - start running. A basketball team may be starting their defense at half court, but if the score on the board and the time left on the clock indicated they might lose using the current strategy, they might change to a full court press in an attempt to overcome. The more oil you want, the harder you need to press. Jesus was among the olive trees in Gethsamane on the Mount of Olives when He experienced the ultimate pressing. His sweat became as blood when He pressed through to the decision to give His life in a cruel fashion as our substitute. His temporary separation from the Father was the most difficult part of the journey. But He did it for us.
Luke 22:41-42, 44 NKJV
And He was withdrawn from them about a stone's throw, and He knelt down and prayed, saying, "Father, if it is Your will, take this cup away from Me; nevertheless not My will, but Yours, be done." And being in agony, He prayed more earnestly. Then His sweat became like great drops of blood falling down to the ground.
The author of Hebrews encouraged us to remember Jesus' ordeal when we are undergoing a pressing from the enemy in his attempt to get us to sin or be discouraged.
Hebrews 12:3-4 NKJV
For consider Him who endured such hostility from sinners against Himself, lest you become weary and discouraged in your souls. You have not yet resisted to bloodshed, striving against sin.