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Systolic pressure is the force of blood when the heart beats, and diastolic pressure is the force when the heart rests between beats.

Brandi Marie

Systolic: 
The top number of your reading is called systolic blood pressure. It tells you the force of the blood against artery walls when your heart beats. Your blood pressure is highest during your heartbeat. So, the systolic number measures the maximum pressure in your arteries at the time of the reading.

Diastolic: 
The bottom number is called diastolic blood pressure. It tells you what your blood pressure is when your heart is at rest between heartbeats. Your blood pressure is lowest when your heart is at rest, meaning the diastolic number is the lowest pressure in the arteries during the reading.

Taken together, your systolic and diastolic blood pressure numbers give you and your doctor an idea of how much pressure is in your arteries when your heart is pumping and at rest. There’s often a strong relationship between the types of blood pressure. For example, if you have high systolic numbers, you’re more likely to have high diastolic numbers, too.

Information Source: 
Health Partners website blog

Source link:
https://www.healthpartners.com/blog/which-numbers-mean-high-blood-pressure/#:~:text=The%20top%20number%20of%20your,the%20time%20of%20the%20reading.

Carmen C

81- Systolic blood pressure is the first number on your reading and measures the force of blood as your heart pushes it out. Diastolic blood pressure, the second number, is the force of blood as your heart relaxes and refills.

Kusum Gupta

The 1st number is your systolic pressure-force of the blood flow when blood is pumped to the heart. 
2nd number is diastolic which is measured between heart beats when the heart is filling with blood. Blood pressure changes throughout the day based on our activities.

Lucy Burkitt

It's the oressure of the blood coming out of different components of the heart