lend support, weight, credence, etc. to something
lend support to (something)
1. To embellish something; to add information or details to something, especially to make it seem more credible or probable. He splashed mud all over his car and clothes to lend support to his story about being in the mountains all weekend. We cannot do anything that will lend support to our opponents' allegations about us.
2. To give something one's support or assistance. The president is lending support to the governor's re-election campaign. Your department will have responsibility for the project, but the sales team will lend support if needed.