RELIANCE
count on someone or something
to rely on someone or something.Can I count on you to be there at noon?I want to buy a car I can count on in winter weather.
fall back on someone or something
to turn to someone or something for help.Bill fell back on his brother for help.John ran out of ink and had to fall back on his pencil.
tried-and-true
tested by time and proven to be sound. (Fixed order.)I have a tried-and-true remedy for poison ivy.All of her investment ideas are tried-and-true and you ought to be able to make money if you follow them.
true to one's word
keeping one's promise.True to his word, Tom showed up at exactly eight o'clock.Well soon know if Jane is true to her word. We'll see if she does what she promised.