Question

what do you understand by total lunar eclipse

Answer 1

Earth Blocks the Sunlight. The Moon does not have its own light but shines because its surface reflects the Sun's rays. During a total lunar eclipse, the Earth comes between the Sun and the Moon and blocks any direct sunlight from reaching the Moon. The Sun casts the Earth's shadow on the Moon's surface

Answer 2

When the earth comes between the sun and the moon it block  a lot of the sunlight from reaching the moon.