Trust in plain English is when you feel safe in the presence of someone.
How many people do you feel safe in their presence defines true friendship?
How much do you trust your partner or lover determines the quality and the longevity of the relationship?
How much do you trust your gut instinct determines your actions?
How many people trust a currency determines its velocity?
How much do you trust a newspaper determines its popularity?
When trust erodes, cracks develop and the whole thing crashes.